We'll know when they get prosecuted.
It clearly was classified info. They clearly came across it in an unauthorized way. They clearly published it.
I'm betting they'll not be prosecuted.
After the leaking of the Pentagon Papers, the Nixon Administration attempted to prevent their publicatin. The Scotus ruled against them 6-3. The decision was essentially that there are no limits on the 1st amendment freedom of the press.
The administration attempted to prosecute the leakers....only to discover that we didn't have a law that made leaking illegal. (Since remedied.)
My point is that the Nixon Admin wanted to go after the leakers because they COULD NOT go after the Times. Likewise, we'll not have anyone go after the Times in the Finance Leak because they don't think they can. They'll go after the leakers.
If they succeed that will be as effective as going after the NYT. It will stop it in the future.